Revenues Based on Customer Location (Detail) (USD $) In Thousands, unless otherwise specified	12 Months Ended
	Dec. 31, 2013		Dec. 31, 2012		Dec. 31, 2011
Segment Reporting Information [Line Items]
Total revenues	$ 48,900		$ 53,677		$ 60,239
United States
Segment Reporting Information [Line Items]
Total revenues	6,067		11,389		14,312
Europe and Middle East
Segment Reporting Information [Line Items]
Total revenues	13,384		13,695		19,878
Asia Pacific
Segment Reporting Information [Line Items]
Total revenues	29,449		28,593		26,049
Germany
Segment Reporting Information [Line Items]
Total revenues	5,543		6,840		12,262
Switzerland
Segment Reporting Information [Line Items]
Total revenues		[1]		[1]	6,150
China
Segment Reporting Information [Line Items]
Total revenues	20,472		15,919		13,790
Japan
Segment Reporting Information [Line Items]
Total revenues		[1]	$ 7,744			[1]

[1] Less than 10%